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 Rational expresions and equations: Ratio and Proportions Options
tcursive
 #1 Posted : Saturday, January 28, 2012 2:04:07 AM
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I am trying to help someone solve the following problem: It takes a teacher 45 minutes to grade a set of quizzes and takes her aide twice as long to do the same amount of grading. How long will it take them to grade a set of quizzes if they work together?

brosnan123
 #2 Posted : Thursday, August 29, 2013 11:19:05 AM

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solution: given teacher complete work =45 minaide  complete work =2*(45)=90 min1 min teacher =1/451 min aide =1/90both complete =1/45+1/90=1/30there for when both are 2gether then work to be done =30 min

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